c++ strchr函数_strchr函数返回_模拟实现strchr函数(33)

}

int dot_inplane_in(point3 p,point3s1,point3 s2,point3 s3){

returnzero(vlen(xmult(subt(s1,s2),subt(s1,s3)))-vlen(xmult(subt(p,s1),subt(p,s2)))-

vlen(xmult(subt(p,s2),subt(p,s3)))-vlen(xmult(subt(p,s3),subt(p,s1))));

}

int dot_inplane_ex(point3 p,plane3 s){

returndot_inplane_in(p,s)&&vlen(xmult(subt(p,s.a),subt(p,s.b)))>eps&&

vlen(xmult(subt(p,s.b),subt(p,s.c)))>eps&&vlen(xmult(subt(p,s.c),subt(p,s.a)))>eps;

}

int dot_inplane_ex(point3 p,point3s1,point3 s2,point3 s3){

returndot_inplane_in(p,s1,s2,s3)&&vlen(xmult(subt(p,s1),subt(p,s2)))>eps&&

vlen(xmult(subt(p,s2),subt(p,s3)))>eps&&vlen(xmult(subt(p,s3),subt(p,s1)))>eps;

}

int same_side(point3 p1,point3 p2,line3 l){

returndmult(xmult(subt(l.a,l.b),subt(p1,l.b)),xmult(subt(l.a,l.b),subt(p2,l.b)))>eps;

}

int same_side(point3 p1,point3 p2,point3l1,point3 l2){

returndmult(xmult(subt(l1,l2),subt(p1,l2)),xmult(subt(l1,l2),subt(p2,l2)))>eps;

}

int opposite_side(point3 p1,point3 p2,line3l){

returndmult(xmult(subt(l.a,l.b),subt(p1,l.b)),xmult(subt(l.a,l.b),subt(p2,l.b)))<-eps;

}

int opposite_side(point3 p1,point3p2,point3 l1,point3 l2){

returndmult(xmult(subt(l1,l2),subt(p1,l2)),xmult(subt(l1,l2),subt(p2,l2)))<-eps;

}

int same_side(point3 p1,point3 p2,plane3s){

returndmult(pvec(s),subt(p1,s.a))*dmult(pvec(s),subt(p2,s.a))>eps;

}

int same_side(point3 p1,point3 p2,point3s1,point3 s2,point3 s3){

returndmult(pvec(s1,s2,s3),subt(p1,s1))*dmult(pvec(s1,s2,s3),subt(p2,s1))>eps;

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